654778459 has 2 divisors, whose sum is σ = 654778460. Its totient is φ = 654778458.

The previous prime is 654778393. The next prime is 654778489. The reversal of 654778459 is 954877456.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 654778459 - 2⁹ = 654777947 is a prime.

It is not a weakly prime, because it can be changed into another prime (654778489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327389229 + 327389230.

It is an arithmetic number, because the mean of its divisors is an integer number (327389230).

Almost surely, 2^654778459 is an apocalyptic number.

654778459 is a deficient number, since it is larger than the sum of its proper divisors (1).

654778459 is an equidigital number, since it uses as much as digits as its factorization.

654778459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8467200, while the sum is 55.

The square root of 654778459 is about 25588.6392565138. The cubic root of 654778459 is about 868.3566366140.

The spelling of 654778459 in words is "six hundred fifty-four million, seven hundred seventy-eight thousand, four hundred fifty-nine".